Large-eddy simulation of interactions between a reacting plume and water spray


Xia, J., Luo, K.H. and Kumar, S. (2008) Large-eddy simulation of interactions between a reacting plume and water spray. In, Bradley, D., Drysdale, D., Molkov, V. and Carvel, R. (eds.) Proceedings of the 5th International Seminar on Fire and Explosion Hazards. 5th International Seminar on Fire and Explosion Hazards Edinburgh, UK, University of Edinburgh.

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Description/Abstract

Study on water-based residential fire suppression system has received renewed attention
due to environmental benefit. The progress on gaining detailed knowledge of this complex system,
however, has been relatively slow. The objective of this paper is to pursue a better understanding of
the interaction mechanisms between an upward reacting plume and a downward water spray, as in a
practical sprinkler system, using large-eddy simulations. The flow field is described with threedimensional
unsteady Navier-Stokes equations, and chemical reactions represented by finite rate
chemistry. Coupling of mass, momentum and energy between the Eulerian flow and Lagrangian droplets
has been taken into consideration. Dynamic subgrid scale models are employed to better describe
the unsteady and local interactions without manually tuning model constants. It was found that small
droplets of a diameter of 400 μm have poor penetration capacity, while larger droplets of a diameter of
800 μm are quite effective for fire suppression. Budget analyses of the grid scale kinetic and thermal
energy reveal complex non-linear interactions between the fire plume and water droplets

Item Type: Book Section
ISBNs: 9780955749728 (hardback)
Related URLs:
Subjects: T Technology > TJ Mechanical engineering and machinery
T Technology > TL Motor vehicles. Aeronautics. Astronautics
Divisions: University Structure - Pre August 2011 > School of Engineering Sciences > Thermofluids and Superconductivity
ePrint ID: 48573
Date Deposited: 23 Oct 2009
Last Modified: 27 Mar 2014 18:32
URI: http://eprints.soton.ac.uk/id/eprint/48573

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